A283520 - OEIS

A283520

Number of nX6 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.

%I #4 Mar 09 2017 18:27:01

%S 0,145,26662,2032993,136572268,8593156813,510843580504,29325852758117,

%T 1640229831666201,89905007399752628,4849467980640486825,

%U 258162615558548188175,13593142734850883923120,709070366893625272065463

%N Number of nX6 0..1 arrays with no 1 equal to more than three of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.

%C Column 6 of A283522.

%H R. H. Hardin, <a href="/A283520/b283520.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=3

%e ..0..0..1..0..1..0. .0..0..1..1..0..0. .1..1..0..0..0..0. .1..0..0..0..1..0

%e ..0..0..1..1..1..1. .1..1..1..1..0..0. .0..0..1..1..1..0. .0..1..1..1..1..0

%e ..0..1..1..0..0..0. .1..0..0..0..0..1. .0..0..1..1..1..0. .1..1..0..1..1..0

%Y Cf. A283522.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 09 2017